I pick them up when I see them. Not as common as they once were.
I have a few of 2015's, and I do get disney silver 1 oz rounds in from time to time, I have a snow white up for sale at the moment, plenty of silver disney pendants etc.
I am a buyer/dealer.
Family owned and operated Coin Dealer Based in Canada
I collected them actively from the early 1990s up until they stopped using them. The Disney stores used to sell them, but then they were all closed and you could only get them at DisneyWorld or DisneyLand - which I last visited when I came back to the USA in 2010.
The Disney Dollars stopped being produced about 1 year ago. The reasoning was that most people use their bank cards and/or credit cards for purchases. I have a few and hope to get a few more in the future.
If you collect them and want more, buy them when you see them as you might not get a second chance in the future.